benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 3987 97_SIS_39.87_2004_CA, 2012-11-30,  JMS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE210,  ASH701945E_M,  CR520031622,  NONE, 1.4227, 1.4699, 15, 162815
 3987 97_SIS_39.87_2004_CA, 2012-12-01,  JLS ,  USGS ,  JAVAD,  00621 ,  TRE_G3TH SIGMA3.3.1,  ASH701945B_M,  CR519993703,  NONE, 1.1955, 1.2449, 15, 152645
 3987 97_SIS_39.87_2004_CA, 2013-09-11,  SAH ,  USGS ,  ASHTECH,  ZE120023208 ,  Z-X ZE210,  ASH701945E_M,  CR520031622,  NONE, 0.6999, 0.7588, 15, 162845
 3987 97_SIS_39.87_2004_CA, 2013-09-14,  SAH ,  USGS ,  ASHTECH,  ZE120023208 ,  Z-X ZE210,  ASH701945E_M,  CR520031622,  NONE, 0.6978, 0.7568, 15, 15915